Machinery for the manufacture of paper bags



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MAGHINERY FOR THE MANUFACTURE or PAPER BAGS. N0. 363.729.v Patented May 24, 1887.

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MACHINERY FOR THE MANUFACTURE OF PAPER BAGS. No. 363,729. Patented May 24, 1887.

N4 PEIERS. PnomLimo ra ner. Wnshingion, ac,

UNITED STATES.

PATENT OFFICE. A

\VILLTAM G. GROSS, OF BOSTON, MASSACHUSETTS.

MACHINERY FOR THE MANUFACTURE OF PAPER BAGS.

GPECIFICATIQN forming part of Letters Patent No. 363,729, dated May 24,1887.

Application filed November 16, 1586. Serial No. 219,039. (No model.) A

To all whom it may concern:

Be it known that 1, WILLIAM 0. Guess, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Machinery for the Manufacture of Paper Bags, of which the following is a specification.

My invention has relation to that kind of paper-bag machines of which the machine de scribed and shown in Letters PatcntNo. 116,842, of July 11, 1871, may be taken as the type that is to say, machines in which a plateknife folder (whether reciprocatory or moving continuouslyin one direction) is combined and adapted to operate in connection with a guide-finger, for the purpose of forming the first or diamond fold; and my invention may be stated in general terms to consist in combining with the plate-knifefolder a .creaser-roll, beneath which the plate-knife folder passes, said roll acting to crease and break down the edges of the diamond fold before the 7 bag reaches the feedrolls beyond.

While my invention is adapted to be used in any machine employingaplate-knife folder, it has, however, been devised with more particular reference to the requirements of paper bag machines such as are illustrated and described in a number of patents heretofore granted to me-as, for instance, in my Letters Patent No; 325,059, of August 25, l885,and No. 336,474, of FebruarylG, 1886.

In the accompanying drawings, which will be hereinafter more particularly referred to, I have represented my invention as applied to and embodied in the machinewhich is thesubject of hi ylastnamed LettersPatentNo. 336,47 4. In the practical operation of such machinery, the plate-knife folder, (which rotates or moves continuously in one ,,direction,) when it rises after the first fold is laid, lifts with it the rear or overlying portion of said fold. This action,

particularly in operating with heavy paper, is-

apt to disarrange the parts of the fold, particularly along the opposed V shaped side edges of the fold, (which are practically uncreased,) the consequence of which is that when the bagblank passes between the presser-rolls, the fold is apt to be pressed awry, or its V side edges are apt to be crumpled and creased unevenly. The creaser-roll above referred to remedies this difficulty. I arrange said roll in advance (relatively to the direction of feed) of the point where the plate-knife folder quits the blank, so that the side edges of the fold will be flattened and definitely creased before the plate-knife folder rises. By this operation the fold is put in such condition that after it is lifted by the plateknife folder it will fallback into its original position, the creases determining and assuring the proper outlining of the fold during its subsequent passage between the other rolls of the machine.

In the accompanying drawings, Figure 1 is a plan of so much of the machine as needed to illustrate my invention. Fig. 2 is a section of the same on line 2 2, Fig. 1, the near sprocket-chain being removed in order to permit a full view of the bag-blank. Fig. 3 is a plan of a blank with the first fold laid similar to Fig. 7 of the drawings accon'ipanying' my Patent No. 336,474. a

The machine in its general organization resembles'that shown and described in my said Letters Patent No. 336,474.

D D are the rolls carrying sprocket-wheels E E. F F are sprocket-wheels, which, in conjunction with wheels E E, carry sprocketchains G, on which are mounted the plateknife folders H.

K K are the presser and cutting rolls, by which the uncut central portion that connects successive bag-blanks is severed.

' I is the guide-finger attached to a cross-bar, m, and having connected with it the formerplate Z) and the lap-guide d.

The general construction, combination, and mode of operation of these parts are the same as described in my aforesaid Letters Patent with reference to the correspondingly-lettcred parts therein shown, and require therefore no explanation here. I have omitted from the drawings the former, the mechanism or devices for preliminarily cuttingand slitting the blank, and the spring opener strip, inasmuch as these instrumentalities involve merely preliminary operations and are not essential to an understanding of my improvement. I therefore proceed to a description of the features in which my present invention is comprised.

At a point between the front sprocket-wheels, F,and the heel of the former-plate b is the roll V, which I term the creaser-roll. This roll is supported in suitable bearings in the frame of the machine above the table J,over which the blanks travel, and in position to bear down upon the blanks. The plate-knife folders H pass" between this roll and the table, and to permit the roll to accommodate itself to this it is supported preferably in yielding bearings, as seen at s, Fig. 2. The roll is driven at suitable speed so as to travel at about the same rate with the blank, and for this purpose may take its motion from any convenient driven part of the machine. In this instance it gets its motion through pulleys and a belt, t, from the upper one ofapair of rolls, X, (which in the working machine are the paste-rolls) The operationis as follows: The front end of the blank as it travels beyond the formerplate, with the first fold in condition to be laid, passes beneath the creaser-roll, which bears upon it and breaks down and definitely creases its V side edges 1;, (which edges are shown clearly in Fig. 3.) This takes place before the plate-knife folder H reaches the front sprock etwheels, F. Consequently the fold is definitely broken down, laid and creased at its side edges before the plate-knife folder begins to rise and quit the blank. The effert of this operation and the advantages flowing therefrom have been above set forth.

In the particular machineshown in the drawings the side flaps, 3 of the first fold are, by the lap'guide d,held up until after the first fold travels beyond that guide, which latter, as seen, extends nearly to the heel of the formerplate. It becomes necessary,therefore,under these eonditions,to press with the ereaser-roll upon only so much of the first fold as is incl udedin thetwotriangularsidespacesbounded by the lines o and the dotted lines '0 in Fig. 3. To this end the ereaser-roller is made, as shown in Fig. 1, with two cylindrical side pressingsurfaces, n n, and an intermediate recess, m, at the point where no pressure is to be exerted on the fold.

Having described my improvement and the best way now known to me of carrying the same into effect, what I claim herein as new and of my own invention is 1. The combination, with the guide-finger and the plate-knife folder, of the creaser-roll beneath which the plate-knife folder passes during the operation of forming the first fold, substantially as and for the purposes hereinbefore set forth.

2. The combination of the guide-finger, the plate-knife folder rotating or continuously moving in one direction, and the creaser-roll arranged to bear upon the blank between the guide-finger and the point where the plateknife folder rises to quit the blanlgsubstantiall y as and for the purposes hereinbefore set forth.

8. The combination of the plate-knife folder rotating or moving continuously in one direetion, the guide-finger, the forinerplate, the lap'-guide,and the creaser-roll arranged to bear upon the blank between the heel of the formerplate and the point where theplate-knife folder rises to quit the blank, and formed with side bearing or pressing surfaces and an intermediate recess, substantially as and for the purposes hereinbefore set forth.

In testimony whereof I have hereunto set my hand this 6th day of November, 1886.

VM. 0. CROSS.

\Vitnesses: l

O. A. Phase, VVILLIAM KnLLoeG. 

